The EcoFlow RIVER 3 UPS is the UPS-focused variant of the RIVER 3 platform: same 245 Wh LiFePO4 core, same 3.5 kg body and 25.5 x 21.2 x 11.3 cm footprint, but the switchover time drops from 20 ms on the standard RIVER 3 to under 10 ms. That is fast enough to keep a fibre modem, an ONT and a light IT rack running through a mains dip.

• 245 Wh LiFePO4 (LFP) core with 3,000 cycles to 80% for about a decade of daily use.
• UPS switchover in under 10 ms, half the time of the standard RIVER 3.
• 300 W AC output on a single Type F socket with a 600 W peak, pure sine wave.
• X-Stream charging refills the station to 100% in about 60 minutes from the wall.
• 110 W solar input via XT60 (11-30 V) for silent daytime top-ups at a holiday house.
• Wi-Fi, Bluetooth, IP54 rating and X-Guard protection for daily household use.

Key specs

• Capacity: 245 Wh
• AC output: 300 W (peak 600 W), pure sine
• Solar input: 11-30 V, 110 W max (XT60)
• USB-C: 100 W max
• Cell chemistry: LiFePO4 (LFP), 3,000 cycles to 80%
• IP rating: IP54
• UPS switchover: <10 ms
• Weight: 3.5 kg
• Dimensions: 25.5 x 21.2 x 11.3 cm
• Warranty: 2 years

A good match for households with sensitive fibre-optic gear or a small home-office where a clean UPS with silent LFP chemistry is more important than raw output. In practice the difference between the standard RIVER 3 and this UPS version shows up on desktop PCs, VoIP phones and small NAS units, which reboot on longer gaps but ride through a <10 ms switchover without dropping the session. The unit still fits on a shelf next to the router and pulls only a few dozen watts at idle.